I think there's a subset of tech folks that don't really value UX (which is like 90% of hey's value-add). It's the same people that don't understand Slack's value because "it's just over-hyped IRC"
But what's weird is this sense of anger at products that aren't as flexible. It's like being upset that a new restaurant opened up because they have a set menu and don't let you make your own food. If you like cooking your own meals, great! Keep doing that. This restaurant is for people that want someone else to make a meal for them.
With slack I understand the frustration a little more, since it's something an entire company is going to be using and asking you to use.
Some people like to very carefully craft an experience on their own and some people are happy to have someone else do that.
It's like operating systems. People who want to have it their very specific way use Linux. People who want it to just work out of the box use macOS (but not Catalina).